Device for piercing- blind-slats to receive the staples



NITED STATES PATENT OFFICE.

` JOHN CARPENTER, OF STONINGTON, CONNECTICUT.

DEVICE FOR PIERCING BLIND-SEATS TO RECEIVE THE STAPLES.

Specification of Letters Patent No. 18,037, dated August 25, 185'?.

To all whom t may concern.'

Be it known that I, JOHN CARPENTER, of StoningtomNew London county, andState of Connecticut, have invented a new and useful Improvement inMachines for Cutting the Tenons of Blind-Slats; and I do hereby declarethat the following is a full and eXact description thereof; referencebeing had t0 the accompanying drawings, making part of thisspecification.

My invention consists of a peculiar arrangement of machinery for cuttingthe t-enons on both ends of blind slats, and piercing them for the wirestaples, simultaneously.

Figure l of the accompanying drawings is a front view of the machine.Fig. 2 is a vertical, or top view. Fig. 3 is an end view. Similarletters of reference indicate s1m1- lar parts in each.

The frame A B is made of iron. The top is planed off to form ways forthe cutting heads C D E F, to slide on.

D D are disk wheels, on the side of which, one or more knives areattached, for cutting the tenons. These cutting heads are made toadvance inward, to cut the tenons on the slat, which is held firmly by agripe or Ydog on the holding bar G.

The disk wheel` and cutter attached thereto is shown more conspicuouslyat Fig. 4.

The cutters consist of knives K applied on the front face of the disk,by being dovetailed in a groove formed therein, in such manner, that theouter surface of the cutter which is a plane surface, shall not onlyproject beyond the face of the disk, but shall have a diagonal positionthereon, so that the front or cutting, edge z', shall be higher from thesurface of the disk, than the rear edge y', and so that the forward 0radvancing end z' j of the cut-ter shall stand higher therefrom than thefollowing end z" j', so that the forward or advancing corner z' shall behighest and the opposite corner j shall be lowest from the surface.

The cutter is held from sliding in the groove in which it is fitted, bya bolt, passing through a slot in the plate forming the cutter.

The cutting edge of the knife is curved in such manner, and is placed ont-he face of the disk in such position, as to cut from the outer edge ofthe slat in forming the tenon, a little in advance of the inner orcentral portion, in order that the cutting .jmay be performed easierthanwhen the whole length of the knife should act at once.

The knife being once faced and in position in its place, always retainsits face, the grinding being always performed on the beveled cuttingedge.

From the peculiar mode of settin the cutters on the face of the disk,com ined with the curve given to the cutting edge, the action thereofhas a strong tendency to cause the cutter heads to advance on the workwhile cutting the tenons, so that the heads do not require force tobring them forward while in action, but rather require a counteractionthereon as the cutting edge of the knife as set, acts as the thread of ascrew, to cause it to advance.

According to this system of constructing and applying the knives, theycan always be made to cut a tenon of the same size from their firstapplication, till they are entirely worn out; since the forward orsurface plane is always the same although the cutter is advanced in thedirection from c" y" to z' j as the beveled cutting edge is worn orground away; and to secure this uniformity of size or to enlarge ordecrease the same, it is only necessary to move the cutting platelongitudinally in its seat and fasten it in any proper position by thebolt.

H is a driving cylinder which gives motion to the cutters by the belts Ion the pulleys K.

L is a hand shaft on which is placed an armor link M N, connected byrocking joints M and N with the rods or sweeps P, which arealso'connected with the sliding frames C D E F, so that the operator byturning the hand wheel Q and shaft, may cause both the cutters toadvance simultaneously, to a slat, held by the holding bar, in order toform tenons thereon, and to recede therefrom when finished.

The sweepsl or rods I), are connected to the rocker joints M and N, bypassing through and being held therein by set screws e, in order thatthey may be adjusted at pleasure to any proper position, such as may benecessary by varying the width of slats.

S is a gage screw with right and left hand threads, causing the nuts Rwhich do not revolve with the screw, to traverse toward, or from thecenter, by turning the screw, which is done by the operator at thepulley T. These nuts when adjusted serve as stops or gages to govern thetraverse of the cut-- ting heads, and consequently the length of theslat when inished, by means of arms or brackets H, reaching from thesliding frame and spanning the screw loosely, and susceptible oftraversing freely, till one or the other of the brackets U come incontact with the nut.

In front of the cutting disks D, and connected with the sliding frameare spring clamps F to hold the slats steady, and to furnish supporttherefor at each end, while being cut; the middle of the slat restingon, and being held by the holding bar Gr, which is iXed iirmly in itsposition on the frame.

s, s, are springs for these clamps which press on the upper jaw, withsufficient force to hold the slat steady.

g is a sliding dog carrying the piercing points h, for piercing the edgeof the slat for the wire staple, and which tends also to hold the slatirmly, by penetrating it and pressing thereon while forming the tenon,and is actuated by the eccentric e, on the hand wheel shaft, through themedium of the yoke f, elbow lever Z, and arm m; the holding bar G, beinghollow beneath its upper surface, and having a slot through which thesliding dog g, may connect with the arm mi.

'Ihe form of the eccentric e is sectoral as shown at Fig. 5, and is soconnected, and applied as to act rapidly in `moving the sliding dog,While the cutting heads are at, or near their eXtreme distances; butmore gradually, and to cease to act thereon, as they approach, whilecutting the tenons; the dog while in this action pressing hard ontheedge of t-he slat, and the piercing points being fixed therein.

In the use of this machine I proceed as follows viz.: Having adjustedthe gage screw, so that the nuts R, R, shall stand in proper positionsthereon, and having so adjusted the connections or sweeps P, (whichactuate the traverse of the cutter heads) by the set screws .e in therocker joints M, N, as to suffer the cutter heads to approachsufriciently, to allow sufficient length to the slat when the tenons arecut thereon, and allowing the outer brackets U to come in contact withthe nuts R; care being had also that the eccentric e which actuates thesliding dog g, shall be so set on the shaft, as to press upon and causeit to hold and pierce the slot and cease to advance at the proper time.The slat is then placed upon the holding bar, and the hand wheel isturned so as to draw the cutter heads inward toward the center, thespring clamps F, connected therewith receive the ends of the slat asthey advance while the sliding dog having already advanced and piercedthe edge of the slat, holds it firmly, while the cutters continue toadvance thereon and cut the tenons after which by a reverse action ofthe hand wheel it is liberated and removed, and the process may berepeated by inserting another slat.

I am aware that machines have been constructed for cutting the tenonssimultaneously at both ends of blind slats, as in the machine patentedby Hastings Bumsey and Chamberlin Feb. 20th 1855 and also for cuttingthe tenons and` piercing the slats for wire staples simultaneously as inthe machine patented to T. G. Stagg March 28th 1854. But I do' not claimany device or action included in either of these machines referred to.But

What I claim as my invention and for which I solicit Letters Patent is,

I do not claim the application of a sliding dog to clamp and hold theslat, while another dog or other device independent of this is used forpiercing the slat for the staple; but I claim the application of thepiercing points h, to the sliding dog g, so that the slat may be piercedfor the wire staples by the same action as that by which they are heldsecure t'or forming tenons thereon as described.

JOI-IN CARPENTER.

Witnesses:

N. SCHOLFIELD, NELSON A. WOODARD.

